Dust deflector



Dec. 12, 1939. G. s. KELLEY 2,183,262

` DUSVT DEFLECTOR Filed sept. 22, 1938 ,f4 fr J4 y ,e4 'Yi y I [f J6 Y 44 4005/ I mi Ill Il 50 l@ I@ Y m ////7Z ky) n V 4f*- R- l I y' c `(leorgej SilellejaMount Vernon,'/,.l., toulradco Corporation, NewYork, N. Y., a

poration of New York `App1iationfsepmber ,22, 193s, serial No. 231,155

3' claims; (o1. 's55- Std1 PatentedDec. 12, 1939 f .y l 571i 111i Y .Ar u* nUsT DEFLECT'OR H This invention relates to dustv deflectorsfand more particularly to dust deflectors adaptedv for -use| in connection with rock drillingapparatus equiplgne'd With means vfor ejecting the dustfrom the holes being drilled.

This 'invention is Van improvement of 'thessubf-l ject matter of my Patent No. `2,055,768, issued September 29, 1936, and its r'nr'incpalI object is to improve the operation and "effectiveness of ,apparatus of the general characterfdescribed inI thaty patent. l

More particularly, itis an object of this in- 4vention to preventthe escape of'dust'duringthat period invvhioh a drill hole is being started., yStill another object of the inventionv is vto prevent, in a relatively simple and'eiectve manner,

atthe upper refer to similar parts, I

Figure 1'is` an elevation in section ofa pre- 5 ferred embodiment ofthe invention asfa'pplied to a rock drilling mechanism including'the drill steel, portions of the rock drill being in section.

Figure 2 is=atransverse `vievv taken through the lower part of the delector on` line 2--2 in Figure l, looking in the direction of thearrows,

and

Figure 3 is a vertical section of the lower part of the dust deector andits skirt, showing the deector inserted in a drill hole.

Referring more particularly 'to the drawing, the

dust deflector consists generally `of a tubular:

to, When the hole is being started as at i8, tubular portion .I0 vrests on thebit 4I6 and enters the hole as the latter deepens. In practice it has' been found that the bit I6 will obstruct the hole inthe tube I0 so that the suction at that point, as will be hereinafter described, Will not be, sufflcient to collect all the cuttings-generatedat the face ofthe bit IB. To obviate thisdiiculty, a`

skirt is provided on the tubular portionfl tting lto `guide Ain a smooth path, such dust-laden air ing at the opening 34 vprovidesa blast of suf-v 42 of any suitable design.

tightly at smaller diameter es and flaring out in aA generally'con'ioal shape as 'at 22.' This skirt 1 j' may be of any suitable exiblernaterialfand is preferably relatively limp, so as not toffobstruc't y the dropping ofthe tubular member It in` the hole i3 as the drilling progresses. The skirt.122

' confines the dustformed by the bit Iiiv so that they dust will bel Withdrawn by wayof thetube itl. Obstructicnfto the passage of 'dustladen air into the tube It at its extreme lower end yis counteracted byprovision of oriiices,in this 'instance two, as Zit-sufficiently wide 'tc enable suction in the tube I t to evacuate the space within' the skirt 2 2. The upper end 25 of tube-l! is open and is adapted'topermit atmospheric air to g15 enter as itWill. I As .has been described in the patentabove re-` ferred to, the angularly disposed conduit If is v attached 'to a hose 28' leading to suitable suction apparatus (not shown), but adaptedto withdraw airbin quantities substantially greater thanH/ inn by means cfa .'c'urrentof air flowing# counter to, the direction of vparticles xblown.;Duty-off -the hole bythe usual stream of cleansingair introduced through the drill steel.

In order to facilitate the passage of dust into theextension It, a ybaille 32 is provided extending intothe path of the stream'of air-laden-dust passing upwardly in the tube It), and is adapted tothe hose'23. Means are provided by this invention to insure that the dust laden stream will be .deflected intovthe conduit I4 and, to this-end,` an air inlet -34 isprovided in the tube II), slight-k ly below the lower edge of deflector 32. Air entercient magnitude to convey the entire batch of dust-'laden air sidewise to be engaged by the deflector 32.

f lAs shown in Figure 1, drillsteel I2 is, in this instance, of the lugged Variety, having projections 36to engage a chuck sleeve 3B, suitably mounted in ythe front-head 40 of a pneumatic rock drill In operation, the drill steel I2 is slipped through the frontend of the tube IU'of the clust deector shank'end first,` the lugs "36 beingv of 'a diameter less than theinternal diameter of the I tube, I0. The steel I2 is then inserted into the' 1. front end ofthe chuck 38' of the rock drill 42 and 55 the bit I6 is positioned on the rock bed 44 at the point Where it is desired to drill a hole I8. 'Ihe deflector forms, at this stage, a guide for the bit I6, inasmuch as the drill operator may hold the drill steel-steady by pressure of his foot against the skirt 22 or the tube I0.

Under usual circumstances, the evacuating apparatus attached to the hose 28 is continuously operated so that chips and dust generated by the bit I 6, as the hole I8 is being started or collared pass into the interior of the skirt 22 and are Withdrawn either `at the lower end of the tube Ill beyond the Wings of the bit I6, or through the holes 24. Dispersion of the dust formed by the bit I6 is increased by the introduction of cleansing air passing from the drill through the center hole 30 of the hollow drill steel I2, for the purpose of keeping the rock face clear of cuttings. V 4The column of dust and cuttings passing up wardly through the tube I is met as it approaches the baie 32 by a blast of air introduced at the aperture 34 due to suction in the direction of the hose 28. The column of dust-laden air is thus deflected into the sidewise extending conduit I4 and led to a suitable disposal means (not shown). v

In addition to the blast of deector air entering at the aperture 34 a further counter current stream of air, also passing to the conduit I4, is introduced at the upper end 26 of tube I, which turns back any particles which may have had sufcient momentum to carry them through the blast at aperture 34. v

As drilling continues, deepening the hole IB as shown in Figure 3, the skirt 22 collapses, preferably, from the weight of the deflector or by pressure applied. Thereupon, the tube Ii] drops into the hole I8 and the skirt is temporarily inoperative as being unnecessary until another hole is to be collared. The tube IEI of the dei-lector is adapted to remain in the hole, as shown in Figure 3, during all further drilling operations in that hole.

' Thus are accomplished among others, the objects hereinbefore referred to.

'I'he present invention has been found to be a highly eflicient device for effecting the positive and emcient removal of dust from both the drill hole and the vicinity of the drilling operation. As will be readily appreciated, it is of simple construction, and so designed that it may be conveniently and cheaply manufactured.

I claim:

l. A dust deflector comprising a substantially straight tubular portion adapted to receive a drill steel and to fit into a drill hole formed thereby, an angularly disposed conduit connected with said tubular portion intermediate, a baffle in said conduit at its juncture with the tubular portion for guiding dust-laden air into said conduit from said tubular portion, and an aperture inter mediate the ends of said tubular portion oppositely disposed therein with respect to said conduit; to direct a jet of air in the direction thereof.

2. A dust deflector comprising a substantially straight tubular portion adapted to receive a drill steel and to t into a drill hole formed thereby, an yangularly disposed conduit connected with said tubular portion, a baillein said conduit at its juncture with the tubular portion for guiding dust-laden air into said conduit from said tubular portion, said tubular portion being provided with an aperture oppositely disposed therein With respect to said angularly disposed conduit to direct a jet of air into the said conduit, and a eXible skirt on said tubular portion adapted to over-lie the drill hole.

3. A dust deflector comprising a vsubstantially straight tubular portion adapted to receive a drill steel and to fit into the drill hole formed thereby, an angularly disposed conduit connected with said tubular portion, a bale in said conduit at` its juncture with the tubular portion for guiding dust-laden air into said conduit from said tubular portion, and an aperture intermediate the ends of said tubular portion oppositely disposed therein with respect to said angularly disposed conduit to direct a jet of air in the direction thereof, a flexible skirt on the tubular portion overlying the drill hole adapted to collapse as the tubular portion enters the drill hole and lateral disposed apertures in said tubular portion communicating with the space within said skirt.

GEORGE S. KELLEY. 

